A318216 - OEIS

A318216

Number of nXn 0..1 arrays with every element unequal to 2, 3, 4 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

0, 1, 4, 174, 24576, 12458503, 21578384304, 127593300875084, 2578465118138197116, 178097203297601659441467, 42043114501504823608330154694

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OFFSET

1,3

COMMENTS

Diagonal of A318222.

LINKS

Table of n, a(n) for n=1..11.

EXAMPLE

Some solutions for n=5

..0..1..0..0..1. .0..1..1..0..1. .0..1..0..1..0. .0..1..0..0..1

..1..1..0..1..0. .1..0..1..0..1. .1..0..0..1..0. .1..1..0..1..0

..0..0..1..1..0. .0..0..1..0..0. .0..0..0..1..0. .0..1..1..0..1

..1..0..1..0..1. .1..1..0..1..0. .1..1..0..0..1. .0..0..0..1..0

..1..0..0..1..0. .0..0..1..0..1. .0..0..1..1..0. .1..1..1..0..1

CROSSREFS

Cf. A318222.

Sequence in context: A145245 A081783 A222921 * A006433 A251695 A343610

Adjacent sequences: A318213 A318214 A318215 * A318217 A318218 A318219

KEYWORD

nonn

AUTHOR

R. H. Hardin, Aug 21 2018

STATUS

approved